John was piloting a plane behind a car but was never able to overtake it. Why?

How can you make number one disappear by adding something to it?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

I travel all around the world but always stay in the corner. What am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?